zone "{{ domain }}" {
  type master;
  file "{{ database_file }}";
  notify yes;
  allow-transfer {
    {% for fqdn in slaves %}
    {{ hostvars[fqdn].ansible_default_ipv4.address }};
    {{ hostvars[fqdn].ansible_default_ipv6.address }};
    {% endfor %}
  };
  also-notify {
    {% for fqdn in slaves %}
    {{ hostvars[fqdn].ansible_default_ipv4.address }};
    {{ hostvars[fqdn].ansible_default_ipv6.address }};
    {% endfor %}
  };
};